Automatic dumb-waiter stop.



No. 669,266. Patented Mar. 5, mm.

6. w. PIERCE &. A. McMAHON AUTOMATIC DUMBHWAITER STOP.

(Application filed Dec.'18, 1900.) (No Iodal.)

TNE NONI]! men: ca, PMoToLm'co, WASNINGTDN, o c? UNITED STATES CHARLESW. PIERCE AND ARTHUR MCMAHON, OF SAN FRANCISCO, CALIFORNIA.

AUTOMATIC DUM B-WAITER STOP.

SPECIFICATION forming part of Letters Patent No. 669,266, dated March 5,1901- Application filed December 13, 1900. Serial No 39,624. kNo model-iTo bl/Z whmn it may concern:

Be it known that we, CHARLES W. PIERCE and ARTHUR MOMAHON, citizens ofthe United States, residing in the city and county of San Francisco,State of California, have invented an Improvement in Automatic Dumb-WVaiter Stops; and we hereby declare the following to be a full, clear,and exact description of the same.

Our invention relates to improvements in automatic stop devices fordumb-waiters or elevators.

It consists, essentially, of a hinged rest upon the wall of the well inwhich the cage travels, a cam-lever carrying a pawl or catcher by whichthe rest is engaged when lifted, a step upon the cage adapted to liftthe rest in the upward travel of the cage and by which the cage issupported upon the rest, a pivoted projecting member upon the cage belowthe step which lifts the rest into engagement with the pawl in theupward movement of the cage and out of the way of the step in thedownward movement of the cage, a shoe upon the cage above the step whichengages the cam-lever in the descent of the cage and releases the rest,and of details more fully explained in the following specification andaccompanying drawings and pointed outin the accompanying claims.

Figure 1 shows the lower portion of a cage and the stopping device inthe side of the well. Fig. 2 is a face view of the stopping device.

The object of our invention is to furnish a simple, satisfactory,noiseless, and self-regulating means by which a dumb-waiter or elevatorrunning from floor to floor of a building can not only be stopped andsecurely held at any desired landing, but may freely descend withoutinterruption from the stops or rests upon which the cage is supported atany of these landings.

Having reference to the drawings, Ais a base-plate fastened upon thewall of the well in which the dum bwaiter B runs. The dumbwaiter or cageis carried by a rope or cable, as usual.

3 is a rest or stop hinged at 4 and supported upon the brackets 5,secured to the plate A. A rubber cushion 8' prevents the stop striktopermit the ascent and descent and stopping of the cage at will, we haveprovided a hinged lifter 7 upon the cage, by which the stop is raisedand engaged by a pawl or catcher 8 upon a cam-lever or trigger 9. Thislifter is secured below and in line with the step 6 and has its endprojecting a little beyond the end of the step in order that the stopmay be lifted high enough surely to be engaged by the pawl. The lifteris hinged at 10 and has a rearward extension II, which prevents thelifter swinging below a horizontal line, while at the same time it isallowed to swing upward in order on the descent of the cage to ride overthe stop if the latter should be down. A rubber cushion 7 deadens thesound caused by the dropping of the lifter. The lever or trigger 9 isfulcrumed on the plate A, as at 12. Its longer arm forms a cam portion,and on its shorter arm is the pawl 8, whose swinging movement is limitedby the pins 13. Cushions of rubberor other resilient material are placedat 15 and 16, by which the concussion of the respective arms upon thebase-plate is relieved. As the cage ascends the step merely lifts thestop, which drops back again in horizontal position on the bracket assoon as the step leaves it. The lifter, however, next hits the stop andraises the latter, so that it is caught by the pawl, where it is heldtill the descent of the cage, when a projection or shoe l4 strikes thecamarm of the trigger, lifts the latter, and releases the stop from thepawl. Thus the movement of the cage automatically controls the positionand operation of the stop. It is also of great advantage to have a cagerun as noiselessly as possible. Except where the face of the stopstrikes and rests upon the bracket we have, as shown, provided rubberbuffers in all cases where the striking of the metal parts would causeannoyance.

As some sort of a signal is necessary to tell of the approach of a cageto a landing the click caused by the falling of the stop against thebracket serves in lieu of means-as, for example, an electric bell, 850.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is

1. In an elevator stop device, the combination ofa horizontal rest orstop upon the frame in which the elevator runs and hinged so that it maybe swung upwardly; a support by which the rest or stop is prevented fromswinging below a horizontal line; a cage, and a projection thereon forengaging the rest or stop whereby the cage is supported; means carriedby the cage for elevating the rest or stop out of the path of movementof the cage; means for holding the rest or stop elevated; and means forreleasing the rest orstop from its elevated position.

2. In an elevator stop device, the combination of a movable horizontalrest or stop in the elevator-shaft; a support for saidrest or stop;acage; a projection on the cage adapted to rest upon said support; meanscarried by the cage for removing the rest or stop out of the direct lineof movement of the cage; means for holding the rest or stop thusinactive, and means for releasing the rest or stop to allow it to returnto normal position.

3. In an elevator stop device, the combination of a hinged rest or stopupon the wall of the well or framein which the cage runs, a su pport forthe rest or stop adapted to sustain the latter in a horizontalposition,a cage anda step upon the same by which the rest or stop may belifted from its horizontal position on the support, means carried by thecage by which the rest or stop may be further lifted, and means by whichit is held, when thus lifted, out of the way of the step when the cageis descending.

4. In an elevator stop device, ahinged rest or stop upon the wall of thewell in which the cage runs, meaps by which this stop is supported atright angles to the wall, said stop so hinged as to swing upwardlyagainst the said wall, a step upon Ihe cage by which the stop be liftedand by which the cage is supported upon the stop, a projection upon thecage below and in line with the step by which the stop is raised andmeans by which the stop is engaged when thus raised, and

means by which the stop may be automatically released.

5. In an elevatorstop device, ahinged rest or stop upon the wall of theframe in which the elevator runs, said stop capable of swinging upwardlytoward the wall,means by which it' is supported from swinging below thehorizontal, a step upon the cage by which this stop is lifted and bywhich the cage is supported upon the stop, a hinged projection or lifterupon the cage and below the step, said lifter capable of swingingupwardly, but prevented from swinging below the horizontal, and a pawlor catcher, said lifter adapted to raise the stop into engagement withsaid pawl or catcher, and means by which the stop may be released fromthis catcher.

6. In an elevator stop device, a hinged rest or stop upon and supportedat right angles to the wall of the frame in which the cage travels,means upon the cage by which this stop is lifted and by which the cageis supported upon this stop, a lever secured upon the wall of saidframe, apawl or catcher upon the shorter arm of said lever by which thestop is engaged when lifted, means upon the cage for lifting the stopthus into engagement with the catcher, the other arm of the leverforming a cam portion and means upon the cage by which this cam-arm isengaged and I the stop released from the catcher.

7. The combinationin an elevator or dumbwaiter, of a hinged rest or stopupon and supported at right angles to the wall of the well or frame inwhich the cage of the elevator runs, a step upon the cageengaging thestop, and by which the cage is supported upon the stop, a hingedprojection or lifter upon the cage and in line with and below the step,a lever upon the wall of the well, a pawl or catcher upon the shorterarm of the lever by which the stop is engaged when raised by saidlifter, the other arm of said lever forming a cam portion which isengaged by a projection orshoe upon the traveling cage, and by whichmeans the stop is released from the catcher, and cushions by which thenoise caused by the striking ofthese various parts in the machine may beobviated.

In witness whereof we have hereunto set our hands.

CHARLES \V. PIERCE. ARTHUR MCMAI-ION.

Witnesses:

PETER F. DEVINE, MARY A. MCMAHON.

